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2 years ago

I need help with this

Chemistry

2 answers:

notka56 [123]2 years ago

8 0

Answer: B

Explanation: All you have to do to find out if an equation is balanced is count the number of atoms on each side. To be balanced, they must be equal.

In case you didn’t know: The number in front of an element or compound means that you will multiply. For instance, 2AlBr3 would have 2 Al atoms and 6 Br atoms. The subscript number just means how many atoms there are in that compound.

marshall27 [118]2 years ago

7 0

What is it you need help on? there is nothing here????

ANSWER:

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*GIVING BRAINLIEST* *100 points*

ELEN [110]

Answer:

1. Independent variables: temperature, distance, concentration gradient

Dependent variables: The water and food dye because it is being used to measure the rate of diffusion

2. The tube with a higher temperature would have a higher rate of diffusion than a tube with a lower temperature because introduction of heat helps the particles move farther and faster apart

3. A controlled variable can be the amount of food dye used in each tube so you can record an accurate rate of which the food die gets diffused.

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2 years ago

What’s the oxidation number for S2O3

babunello [35]

Answer:

+4 +3(-2) = -2

Explanation:

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2 years ago

g Which ONE of the following molecules and ions has trigonal planar molecular geometry? (NOTE: You must first determine what the

Dmitrij [34]

Answer: C) $CO^{2-}_{3}$

Explanation: The Valence Shell Electron Pair Repulsion Model (VSEPR Model) shows bonding and nonbonding electron pairs present in the valence, outermost, shell of an atom connecting to other atoms. It also gives the molecular geometric shape of a molecule.

To determine molecular geometry:

1) Draw Lewis Structure, i.e., a simplified representation of the valence shell electrons;

2) Count the number of electron pairs (count multiple bonds as 1 pair);

3) Arrange electron pairs to minimise repulsion;

4) Position the atoms to minimise the lone pair;

5) Name the molecular geometry from the atom position;

Trigonal planar molecular geometry is a model which molecule's shape is triangular and in one plane. Such molecule has three regions of electron density extending out from the central atom and the repulsion will be at minimum when angle between any two is 120°.

The Lewis structure of each molecule is shown in the attachment.

Analysing each one, it can be concluded that molecule with trigonal planar geometry is $CO^{2-}_{3}$

8 0

3 years ago

Matter is anything that has what?

SIZIF [17.4K]

Matter is anything that has mass and occupies space.

Anything that has physical or real existence is matter. Everything that exists in the known universe manifests itself as matter or energy.
Matter can be liquid, solid or gaseous. Examples of raw: paper, wood, air, water, stone.

4 0

3 years ago

Read 2 more answers

When was the first record of a scientific method being used?

Dmitry_Shevchenko [17]

Answer:

In the mid-19th century Claude Bernard was also influential, especially in bringing the scientific method to medicine. In his discourse on scientific method, An Introduction to the Study of Experimental Medicine (1865), he described what makes a scientific theory good and what makes a scientist a true discoverer.

Explanation:

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3 years ago